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ACCUMULATED OTHER COMPREHENSIVE INCOME - Change in AOCI by component (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Changes in accumulated other comprehensive income
Balance	$ 1,514,223	$ 1,508,939	$ 768,585
Other comprehensive income (loss)	(10,040)	(11,360)	14,760
Balance	1,539,971	1,514,223	1,508,939
Accumulated Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive income
Balance	12,844	24,204	9,444
Other comprehensive income (loss) before reclassifications	535	(9,997)
Amounts reclassified from accumulated other comprehensive income	(10,575)	(1,363)
Other comprehensive income (loss)	(10,040)	(11,360)	14,760
Balance	2,804	12,844	24,204
Foreign Currency
Changes in accumulated other comprehensive income
Balance	729	(249)
Other comprehensive income (loss) before reclassifications	1,372	978	179
Other comprehensive income (loss)	1,372	978
Balance	2,101	729	(249)
Pension and Other Benefits (recorded in G&A : Other)
Changes in accumulated other comprehensive income
Balance	6,675	22,078
Other comprehensive income (loss) before reclassifications	912	(13,543)
Amounts reclassified from accumulated other comprehensive income	(10,876)	(1,860)
Other comprehensive income (loss)	(9,964)	(15,403)
Balance	(3,289)	6,675	22,078
Unrealized Gains on Marketable Securities (Recorded in Investment income)
Changes in accumulated other comprehensive income
Balance	2,677	81
Other comprehensive income (loss) before reclassifications	(1,056)	2,627	(1,622)
Amounts reclassified from accumulated other comprehensive income	(156)	(31)	925
Other comprehensive income (loss)	(1,212)	2,596
Balance	1,465	2,677	81
Unrealized Gain from Equity Method Investees' Cash Flow Hedge
Changes in accumulated other comprehensive income
Balance	2,763	2,294
Other comprehensive income (loss) before reclassifications	(693)	(59)	2,085
Amounts reclassified from accumulated other comprehensive income	457	528	(510)
Other comprehensive income (loss)	(236)	469
Balance	$ 2,527	$ 2,763	$ 2,294

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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